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MSNBC
Apr 17, 2013 2:00am PDT
justice correspondent pete williams has the very latest. >> reporter: investigators have begun the process of recovering tiny pieces of the bombs to learn how they were made. they say it appears the devices were assembled inside pressure cooker pots similar to this one, packed with bbs, ball bearings and nails. pressure cookers have been used for decades in terror bombings. instructions for making them appear on the internet, including just last month in an al qaeda magazine "inspire." investigators say the explosion in boston was smokeless powder, gunpowder like this available at sporting goods stores, not something more powerful like dynamite. and they believed they were carried in the scene in dark nylon bags and set off by timers. the area was checked twice for bombs but there was no security screening. >> because there is unrestricted access to the racecourse, simply because it's 28 miles long, people can come and go and bring items in and out. >> reporter: authorities searched the apartment of a foreign student injured in the blast and seen run ago way but they found nothing and he i
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